Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977)
Subgenus: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977)
Species: (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. subparvulum ?
or S. biexcavatum ?
50 x 62 μm
Shinobazu-ike
Tokyo, 2001
S. subparvulum ?
or S. biexcavatum ?
μm
Ohdo-ike
Chiba, 2007
S. subparvulum
μm
O-ike park
Yabuki
Fukushima, 2003
